Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1994-11-02
1999-02-16
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
345100, G09G 500
Patent
active
058725636
ABSTRACT:
A bidirectional scanning circuit for a peripheral driving circuit for a liquid crystal display, a contact-type image sensor, a liquid crystal shutter, a vacuum fluorescent display or the like is improved in operation speed and yield in production. In the scanning circuit, a data signal is successively delayed and transferred to produce scanning pulse signals to be outputted. The scanning circuit comprises a plurality of switching transistors connected in cascade connection such that each switching transistor receives a data signal outputted from a preceding switching transistor and passes the data signal so as to be applied to a following switching transistor in response to a pair of clock signals, a plurality of feedback circuits each for receiving a signal outputted from a corresponding switching transistor in response to a further pair of clock signals and compensating for a drop of the signal level of the thus received signal, and a plurality of buffer circuits for individually receiving signals successively outputted from the feedback circuits and individually outputting the received signals as scanning pulse signals.
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Hjerpe Richard
NEC Corporation
Tran Vui T.
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